Blasting cartridge



\ Aug. 3o, 1932.

FQH. KNEELAND LAs'rING cAR'rRIDGE 2 Smets-Sheet 2 Filed Nov. 2s. 1929 y AQ v integree Aug. 3c, ieee FRANK E. KNEELAND,

oii'vcHIcAGo, immers, oir cnicaoo, ILLrNois,

.essieNon 'ro SAFETY armure comma, A CORPORATION L i :emsrme aannames i Appiication med November 25;.

` l The present invention relatesto blasting cartridges of that type `wherein acompressed gas, such as carbon dioxide, is employed as theblasting medium and the blasting pressure of the `charge of .compressed gas is brought about by applying initiated by an electric squib, matchhead or "1G the like. `It now appears to be desirable to i reduce this pheat "without theaid of commay be produced without i .fg y ,i invention to i `2o ustion.. i

y IIt is an obiect of the invention to provide `a heatin deviceor blasting cartridges of the type in icated whereby rthe necessary heat the `aid of combustion. i i l t *More it is an object `of the i rovide a heating device embodying a p urality `of substances which, xwhen`cornbined, are capable of `producing z, particularly,`

" heat, with means for bringing the" substances p together at will. i t Another object ofthe invention is to provide a heating device embodying a plurality i of separated substances, `with meanssusceptible of remote controlfor causing such subi stances to be brought together.

Other objects and I`advantages will appear [in connection ywith `the following description of the inventionas illustrated in the accompanying drawings: y Referring to the drawings,`

f Figure i is a 'View in longitudine Section l `of a blasting cartridgeof the type with which the present invention may be employed, and

. illustrating the" heater unit in position therein. i

Figure 2 is a viewin transverse section i i0 iut-,aken along line 2-5-2 o Figure 1.

FigureV 3 is a view in transverse section taken along line 3-3 of Figure 1.

Figure 4 is a view intransverse se taken along line 4 4 of Figure 1.

Figure 5 is a longitudinal section thru a heater unit constructed in accordance with my invention.

Figure 6 is a v of the inner; container of the heater unit M shown in Figure 5.

Itfwilli be noted that in isfsubstantially `spherical and u mediate portion tiontionvlZ` of the electrode.

.view in longitudinal section ieee. semina. 409,638.

Figure 7 is a sectional view of onegofthe metallic end capsfor the inner container.

Figure 8 is a detail view of the device o renderingthe heater unit active.

` Figure 9 is a transverse section along :line y place by a shear ring 4 and a discharge cap. d the form-Shown the discharge cap thatit is provided with a pluralit of radial orts 6 through which gas may be discharged. The opposite end of the cartridge is provided withian electrode 7 and a: charging valve 8. The reduced portion-f1() of the electrode extends into the gas chamber 2 and` is surrounded by an electrode nut 9` whichrhas threaded engagement with the -body of the cartridge. `Interposed between the outer face of the electrode nut 9 and the enlarged inter- 12 of the electrode, there is provided an insulating and sealin disc 13. This sealing disc may be formed wit an axial tubular extension surrounding `the reduced portion 10 of `,the electrode and separating the latter electrically with respect to the electrodenut 9. The opposite end of the electrode is surrounded by a second nut 15 which is screw threaded intothe end of the cartridge body and engagesan insulating disc 16 which is positioned in engagementrwith the enlarged `por- The` extreme outer end of the electrode is formed to receive a snap-on contact plug as.-indicated atll. Surrounding the peripheral portion of the enlargement 12 ofthe electrode isan annular insulating' band 14 which completes the insulation of the electrode from the body of the cartridge. Leading into the gas chaintheouter radial face oi'` er 2 and a ruptur i t `to` overlie and seal the i "open end of the chamber. Thedisc `is held in i STA-Tes raili'r` OFF-ICE ber 2 is a charging passage 16 with which the conical end of the valve 8 is designed to cooperate. When the valve 8 is withdrawn from engagementwith the end of the passage 16, this" passage is in communication withthe principal charging orifice v17 which is defsigned to cooperatewitha suitable charging Beazlement'with the body of the cartridge as'indi cated at 18 in order to provide for the neces- The valve 8 has threaded engagesary .range of adjus'tnfientthereof. A suitable packing 19 surrounds the4 stem of the valve in order to prevent leakage of gas thereabout.

l The electrode and valve assemblies are provzo tected by means of a cap 20 which has a screw thread connection with .the end of the lcartioned.` Such a unit is indicate atv 23 in Figure 1 and as therein shown is provided with contacts at its, opposite ends, whlch engage ithe end 'of the electrodeand the ruplturable .disc 3-.respectively. Heretoforey it hasbeen-customary ,to employ heater units ,consisting of Achemicals capable of producing high degrees of heat when ignited `by means of an electric matchhead embedded therein and .having leads connected to therespective contacts at opposite ends of the heater unit.

The heat thus generated is imparted to a charge of gas contained within the chamber2 for the purpose of increasing the pressure of the charge to such a point that the rupturable disc will beblown out.

heat required to brin about the blasting` sure of the gaseous c arge is develope According to the present invention, thereis provided a heater unit desi ed for luse 1n the manner above described, ut wherein the preswithout the aid of combustion.. -f

r Referring particularly to Figures 5 to9 inclusive, there is shown a heater unit which consists of two concentric'- tubes k22 and 23,

`the ends of which are closed by. means of metallic caps 25. The ends of the tube 22 are turned inwardly to engage the radial portion of the caps 25 and prevent endwise removal of the jcaps. The tube 23 is so designed as to snugly, fit the interior Vof caps 25.

The space between tubes 22. and 23 is preferably filled with quick lime, while theV interior of tube 23 is designed to hold a quantity of water. In order to furtherseal-the ends of 'tube'23- there isprovided a plug28 and 29 for each end. Thus there is provided a heater, the constituents of which `are inert until brought together and for this purpose proved heater Vimpossible for vthe discharge .mined point, of causing the said predetermined L increase of ,pressurey b there is provided an electric matchhead 30 i f head and the explosive, thus causing a. rapid and intimate mixture of the water and the quick lime. The result of this mixture is a relatively rapid production of heat which serves to increase the pressure of the gaseous charge and thereby develop the blasting pressure necessary to rupture vthe disc.

It will be noted that inthe use ofthe imhereinabove described, the ignition of the matchhead and the explosive will be extinguished substantially coincident with the mixture of the Water and quick lime. It will bev appreciated, therefore, that the ignition is extinguished 'before the developf mentof heat is started andthat it is therefore any flame o r spark to be present when the discharge of the cartridge takes placer The entire heat required for of the cartridge is generated by the mixture of quick lime and Water, and

after the matchhead and small amount ci explosive has been extinguished. The only function of the matchhead and explosive is 'to bringy aboutv the mixture of the quick lime and water at the desired time and by a means susceptible of remote control.l It is therefore absolutely impossible to cause ignition of mine gases or other explosives by the use of blasting cartridges employing the im proved.v heater herein describe lclalmv:

y1. The combination with a lsubstantially indestructible blasting cartridgev having a. gas chamber adapted to be charged with compressed gas, anda pressure responsive venting device adapted to permit discharge of sald gas lwhen the pressure of the ysame has been increased to a substantially predetera non-combustible' means for the application of heat to the compresse gas.

2. The combination with a substantially indestructible blasting cartridge havingv a gas chamber adspted to becharged with compressed gas, an a pressure .responsive vent- 'lng device adapted to permit discharge of said gas when the pressure of the same has been increased to a substantially predetermined point, of a heater unit capable of producing heatin suiiicient amount to increase the pressure of said gas, by expansion, to said predetermined point, sald unit con-` sisting of normally separated substances adapted to be brought together at will and Leven 3 i adapted when so brought together to -produce the desired heat. 3.Thecombination with a substantially indestructible blasting cartridge having a gas l chamber adapted to be charged with comw e pressed gas,and adpressure responsive vent-V ing device adapte to permit; discharge of 'said gas when the pressure of the same has lbeen `increased to` a substantially redeterlo mined point, of a heater unit capab e of producing heat in sucient amount to increase the pressure of said gas, by expansion, to said predetermined point, said unit consisting o normally separated quantities ofY quick u limeandwater, and means for bringin said lime and water `to ether at will, where `y to produce the desire heat.- Signed et Chicago, Illinois this 19th day of November, 1929. j

" FRANK H. KNEELAND. 

